What Causes Body Itching?

I have this none stop facial hair,and whole body itch! I believe it is a infestation of some sort! Feel like thing. Are crawling on my face,ears,eyebrows,nose,body,hair! But yet i check all over,and cant see nothing! The itch,and crawling. Is worst at night! I always take two showers! With very hot water! Im a clean person!,so you can rule out,poor hygiene!! My 100% guess is that what ever it is,must of caught it at my old job!,walmart! Thats where it all began! Dust from boxes! Cleaning up mice poop, and there was a time where i had to remove an old mattress from the parking lot! Looked like a bumbs mattress, cause people sometimes slept behind my job!or in the woods! Ive tried hair and body lice! And nothing improved please help me to determine, what it could possible